参数资料
型号: MC68HC05SB7
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: MO-150, SSOP-28
文件页数: 97/170页
文件大小: 2161K
代理商: MC68HC05SB7
GENERAL RELEASE SPECIFICATION
August 27, 1998
MOTOROLA
INTERRUPTS
MC68HC05SB7
4-2
REV 2.1
NOTE
If more than one interrupt request is pending, the CPU fetches the vector of the
higher priority interrupt rst. A higher priority interrupt does not actually interrupt a
lower priority interrupt service routine unless the lower priority interrupt service
routine clears the I bit.
4.2
INTERRUPT PROCESSING
The CPU does the following actions to begin servicing an interrupt:
Stores the CPU registers on the stack in the order shown in Figure 4-1.
Sets the I bit in the condition code register to prevent further interrupts.
Loads the program counter with the contents of the appropriate interrupt
vector locations as shown in Table 4-1.
The return from interrupt (RTI) instruction causes the CPU to recover its register
contents from the stack as shown in Figure 4-1. The sequence of events caused
by an interrupt are shown in the ow chart in Figure 4-2.
$0020
(BOTTOM OF RAM)
$0021
$00BE
$00BF
$00C0
(BOTTOM OF STACK)
$00C1
$00C2
UNSTACKING
ORDER
n
CONDITION CODE REGISTER
5
1
n+1
ACCUMULATOR
4
2
n+2
INDEX REGISTER
3
n+3
PROGRAM COUNTER (HIGH BYTE)
2
4
n+4
PROGRAM COUNTER (LOW BYTE)
1
5
STACKING
$00FD
ORDER
$00FE
$00FF
TOP OF STACK (RAM)
Figure 4-1. Interrupt Stacking Order
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